AKPWMOscillator

Casio-style phase distortion with pivot point on the X axis This module is
designed to emulate the classic phase distortion synthesis technique. From
the mid 90’s. The technique reads the first and second halves of the ftbl at
different rates in order to warp the waveform. For example, pdhalf can
smoothly transition a sinewave into something approximating a sawtooth wave.